This clip is taken from rare footage of the attacks filmed by an Asian news network. It is shot from a different angle to any of the US news networks and shows an interesting occurrence in the North Tower at the moment the South Tower was struck.

Smoke and fire can be seen shooting out of the windows on the impacted floors in the North Tower (right) at the same moment the South Tower (left) was struck by the second plane.

UPDATE:The majority of comments I have had come through about this video conclude that the occurrence is a result of the suction caused by the fireball in the South Tower. I also believe this to be true.I would like to thank everybody for their thoughts on this video.